Non-weft unidirectional fiber-reinforced fabrics
A non-weft, unidirectional fabric is provided that includes a plurality of substantially parallel reinforcement fiber bundles. The reinforcement fiber bundles have a first surface and an opposing second surface. The non-weft, unidirectional fabric further includes at least one of a non-woven veil bonded to at least one surface and one or more bands of sprayed adhesive spanning across at least a portion of the width of one of the first and second surfaces of the plurality of substantially parallel reinforcement fibers.
1. A non-weft, unidirectional fabric comprising:
a plurality of substantially parallel reinforcement glass fiber bundles formed from a plurality of glass filaments having diameters of about 5 μm to about 40 μm coated with a sizing composition including a polymeric binder, wherein said polymeric binder is capable of bonding said glass filaments to each other, said reinforcement fiber bundles having a first surface and an opposing second surface, each of the first surface and opposing second surface having a width, said glass fiber bundles being spaced apart, forming flow channels between said fiber bundles; and
a non-woven veil selectively bonded to at least one of said first and second surface by at least one of localized heating of the non-woven veil or localized application of an adhesive material.
2. The non-weft, unidirectional fabric of claim 1 , non-woven veil is a glass veil, a polymer veil, or mixtures thereof.
3. The non-weft, unidirectional fabric of claim 2 , wherein said polymer veil comprises at least one of polypropylene, polyester, polyamide, and polyurethane filaments.
4. The non-weft, unidirectional fabric of claim 1 , wherein said non-woven veil is formed by one of a melt-blown process, a spun-bond process, a dry-laid process, a wet-blown process, and electro-spinning.
5. The non-weft, unidirectional fabric of claim 1 , wherein said non-woven veil is selectively bonded to said at least one of the first and second surfaces by localized heating of said non-woven veil.
6. The non-weft, unidirectional fabric of claim 1 , wherein said non-woven veil is selectively bonded to said at least one of the first and second surfaces by a localized application of an adhesive material.
7. The non-weft, unidirectional fabric of claim 1 , wherein at least 80% of said reinforcement fiber bundles are parallel to one another.
8. The non-weft, unidirectional fabric of claim 1 , wherein said polymeric binder includes one or more of a polyamide, a polytetrafluoroethylene, a polyvinylchloride, a polyester, a polypropylene, a polyphenylenesulfide, a polyethyleneimine, a polyamideimine, a polyether-etherketone, a polyoxymethylene, a polyethylene, copolymers thereof, and mixtures of said polymers and/or copolymer.
9. A fiber-reinforced composite comprising:
at least one non-weft, unidirectional fabric comprising:
a plurality of substantially parallel reinforcement fiber bundles formed from a plurality of glass filaments having diameters of about 5 μm to about 40 μm coated with a sizing composition including a polymeric binder, wherein said polymeric binder is capable of bonding said glass filaments to each other, said reinforcement fiber bundles having a first surface and an opposing second surface, each of the first surface and opposing second surface having a width, said glass fiber bundles being spaced apart, forming flow channels between said fiber bundles; and
a non-woven veil selectively bonded to at least one of said first and second surface by at least one of localized heating of the non-woven veil or localized application of an adhesive material, and
a polymeric matrix material.
10. The fiber-reinforced composite of claim 9 , wherein said reinforcement fiber bundles are at least one of glass and carbon fiber bundles.
11. The fiber-reinforced composite of claim 9 , wherein said polymeric matrix material includes one or more of polyesters, polyethylene terephthalate, polyamide, polyolefin, polypropylene, polyamide, phenolic resin, epoxy, and vinyl ester.
12. The fiber-reinforced composite of claim 9 , wherein said non-woven veil is a glass veil, a polymer veil, or mixtures thereof.
13. The fiber-reinforced composite of claim 9 , wherein said non-woven veil is selectively bonded to said at least one surface by localized heating of said non-woven veil.
14. The fiber-reinforced composite of claim 9 , wherein said fiber-reinforced composite is one of a wind blade and an automotive part.
15. A non-weft, unidirectional fabric comprising:
a plurality of substantially parallel reinforcement glass fiber bundles formed from a plurality of glass filaments having diameters of about 5 μm to about 40 μm coated with a sizing composition including a polymeric binder, wherein said polymeric binder is capable of bonding said glass filaments to each other, said reinforcement glass fiber bundles having a first surface and an opposing second surface, each of the first surface and opposing second surface having a width, said glass fiber bundles being spaced apart, forming flow channels between said fiber bundles; and
one or more bands of sprayable adhesive spanning at least a portion of the width at least one of the first and second surfaces of the plurality of substantially parallel reinforcement fibers, wherein said sprayable adhesive having a shear viscosity of about 2,000 to about 6,000 cps at a temperature of about 250° F. to 450° F.
16. The non-weft, unidirectional fabric of claim 15 , wherein said sprayed adhesive comprises one or more of polyolefin, amorphous poly-alpha-olefin (“APAO”), polypropylene, maleated polypropylene, polyester, co-polyester, polyamide, co-polyamide, polyurethane, epoxy, or phenolic base polymer.